On the Software Development Video & Tutorial site they've shared a video that introduces the PHP to Couchbase connection from Jan Lenhardt.

Couchbase Server is a fully memcached API compatible database that solves performance, scaling and querying needs. It relies on proven technologies like memcached and Apache CouchDB along with a chunk of open source components that make the whole thing work. Couchbase developed a PHP extension to work with Couchbase Server. This video discusses the architecture of the new PHP extension and shows you how to use Couchbase Server's advanced features like views for querying with some tips and tricks when running serious deployments.

The video is a recording of a presentation he did about Couchbase itself - its features, how to get it set up, and how to use it with the Couchbase PHP library. Lots of sample code is included and there's some talk about a typical Apache/FastCGI setup to optimum support.